دراسة العلاقة بين تأثير بعض الظروف البيئية في بعض المعاير الفسلجية و الإنتاجية لأبقار الفريزيان المضربة

الملخص EN

The aim of this study was to conduct the effect of environmental conditions (temperature degree and relative humidity) for three seasons (winter, spring and summer) on some physiological, productive and functional parameters of Friesain dairy cow and their relation with two different lactational stages (Second and third lactational stages).

This study was carried out in Al-Tathamin Dairy plan, Al-Dijyla'a (Iraqi-Jordan Company) at Waist province.

Thirty dairy cows were selected and divided in two groups, each group contains fifteen cows depended on lactation stage.

Blood sample were collected at monthly intervals for hematological examination viz ; packed cell volume haemoglobin, milk yield and milk traits such as fat percentage, total solid material, and non-fatty solid material was measured.

The period of study lasted from 1-January 2006 up to 1-september 2006.

The result revealed following : 1.

Significant decreased in the haemoglobin concentration and packed cell volume were decreased in the two lactation stages (second and third lactation stage).

2.

Milk yield was non significant decreased during summer as a result in increased environmental temperature about 14.1co to 36.1co and decrease relative humidity about 62.2% to 20%.

3.

Milk percentage decrease and reach it's minimum level during summer for the third lactation stage to reach 2.6%.

4.

Total solid and total solid non-fatty material of milk percentage increased for the two lactation stages during spring to reach (12.59%, 9.3%) fore the third lactation stage and (12.22%, 9.6%) fore the second lactation stage.